| APA | Smart Define. (2011). gas-discharge tube thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/gas-discharge_tube/thesaurus/narrower |
| Chicago | Smart Define. 2011. "gas-discharge tube thesaurus" https://smartdefine.org/gas-discharge_tube/thesaurus/narrower (accessed October 1, 2026). |
| Harvard | Smart Define 2011, gas-discharge tube thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/gas-discharge_tube/thesaurus/narrower>. |
| MLA | Smart Define. "gas-discharge tube thesaurus" 26 April 2011. Web. 1 October 2026. <https://smartdefine.org/gas-discharge_tube/thesaurus/narrower> |